Sensitive Detection of Aspartame and Vanillin by Combining Terahertz Fingerprinting With a Metamaterial

Zhang, JinHui; Lang, Tingting; Hong, Zhi; Liu, Jianjun; Wang, Ping

doi:10.1109/jsen.2022.3192527

Cited by 12 publications

(1 citation statement)

References 47 publications

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“…In past research, THz time-domain spectroscopy (THz-TDS) has been demonstrated as a reliable method for measuring the refractive index and absorption coefficient of analytes, but this method uses a huge system and requires large sample amounts [15,16]. To solve the problem, a THz fingerprint sensor based on hybrid-induced transparency was proposed, which observed molecular fingerprints through the coherent coupling of a broadband mode and a narrowband mode, thereby enhancing the sensitivity of the detection [17,18]. In addition, nano-antenna metamaterial and metallic grooves can also be used to detect analytes [19,20].…”

Section: Introductionmentioning

confidence: 99%

A Terahertz Metasurface Sensor Based on Quasi-BIC for Detection of Additives in Infant Formula

Sun,

Lin,

Xue

et al. 2024

Nanomaterials

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Prohibited additives in infant formula severely affect the health of infants. Terahertz (THz) spectroscopy has enormous application potential in analyte detection due to its rich fingerprint information content. However, there is limited research on the mixtures of multiple analytes. In this study, we propose a split ring metasurface that supports magnetic dipole bound states in the continuum (BIC). By breaking the symmetry, quasi-BIC with a high quality (Q) factor can be generated. Utilizing an angle-scanning strategy, the frequency of the resonance dip can be shifted, resulting in the plotting of an envelope curve which can reflect the molecular fingerprint of the analytes. Two prohibited additives found in infant formula, melamine and vanillin, can be identified in different proportions. Furthermore, a metric similar to the resolution in chromatographic analysis is introduced and calculated to be 0.61, indicating that these two additives can be detected simultaneously. Our research provides a new solution for detecting additives in infant formula.

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